Cathodically deposited polypyridine films: A novel electroactive polyconjugated polymer |
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Authors: | Gilberto Schiavon Gianni Zotti Gino Bontempelli |
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Affiliation: | C.N.R. Istituto di Polarografia ed Elettrochimica Preparativa, Corso Stati Uniti 4, 35100 Padova Italy;Istituto di Chimica Analitica, University of Padova, via Marzolo 1, 35131 Padova Italy |
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Abstract: | Poly-2,5- and poly-2,6-pyridine coatings have been produced on glassy-carbon electrodes by nickelcatalysed reduction of the corresponding dibromopyridine in acetonitrile. Poly-2,5-pyridine films display two reversible cathodic cycles, one of which is due to nickel ions coordinated to pyridine moieties and the other to the polymeric backbone. Both reductions lead to the polymer changing from the insulating to the conductive state. Conversely, Poly-2,6-pyridine films are not reversibly electroactive and the differences are discussed in terms of conjugation along the polymeric chain. |
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